Goodheart, a psychologist in private practice and former nurse, offers a primer on the World Health Organization's 10th edition of the International Classification of Diseases (ICD-10) (with the clinical modification for the US (ICD-10-CM)), aiming also to prepare mental health clinicians for the adoption of ICD-11 in 2015. She reviews the ICD system and its history and development, ICD-10-CM, the differences from ICD-9-CM, the strengths and limitations of classifications, and the elements involved in making a diagnosis vs. selecting a diagnostic code, and a preview of ICD-11. The lengthy appendix lists ICD-10-CM codes for mental, behavioral, and neurodevelopmental disorders. Annotation ©2014 Ringgold, Inc., Portland, OR (protoview.com)